So then isn't my description correct? As it currently works, files would be deleted from destination A and only exist in source B. If they are unreadable/corrupt in source B, the only good copy of the file would have been lost when you pruned destination A. Isn't that the exact same danger you cited?
I know I'm oversimplifying things. I appreciate how difficult proper backup is and that you're taking the time to make sure it works as well as it should.
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